I noticed that the Bass++ is basically a UD1 with the 566 oscillator replaced with an LM13700 oscillator. So, I was wondering if anyone has replaced the 566s in the Clangora with lm13700s? All three 566s are outputting just outputting a triangle wave which seems like a simple job for 1/2 a 13700. Also, the 566s are over $10 each now on ebay!

thanks.Last edited by thefunk on Wed Feb 29, 2012 8:20 am; edited 1 time in total

"I noticed that the Bass++ is basically a UD1 with the 566 oscillator replaced with an LM13700 oscillator"

I just checked the schem, and it's not quite that simple. In the Bass++ the LM13700 is setup to act like an AM VCO (I think?)

BTW Not trying to be a killjoy, just trying to understand the schem a bit better, as I've got a board for the Bass+ and I'm keen to get it happening._________________What makes a space ours, is what we put there, and what we do there.

Ah. I should have led with the internet caveat... IMHO
The first half of the lm13700 in the Bass++ looks to me like it was taken, almost exactly, from the lm13700 datasheet as the 'Single Amplifier VCO' which seems to match with the 566 oscillator in the UD1. Maybe the magic is in the second half of the 'shell' circuits? In any case, it looks like the 2 circuit parts are almost interchangeable with adjustments for frequency etc. If I I was more knowledgeable, I'd have a go at switching out the oscillators in the Clangora. Maybe, someone has already done this?

I do not recommend BASS++ circuit (1/2 LM13600) for this project. This design produces a small distortion of the triangular wave a bit difficult to filter. The best option is to use a full-LM13600 for the oscillator core. For my taste the best sound is that similar to the sine wave.

I have not built the Clangora. I have only been tested with Ic's mentioned.
I had saved a LM566 for 10 years...

Awesome! I'll be etching a couple of Clangora boards in the not to distant future. I'll be sure to make one with your conversions to compare the two.

A couple of questions...
1. Is there a reason to specifically use the TL062? Or, would a TL072 etc. or any standard op amp work?
2. On the oscillator core, you have the square wave output after the first stage and the triangle wave output after the second stage. On the datasheet, the outputs are reversed. Which is correct?

Awesome! I'll be etching a couple of Clangora boards in the not to distant future. I'll be sure to make one with your conversions to compare the two.

A couple of questions...
1. Is there a reason to specifically use the TL062? Or, would a TL072 etc. or any standard op amp work?
2. On the oscillator core, you have the square wave output after the first stage and the triangle wave output after the second stage. On the datasheet, the outputs are reversed. Which is correct?

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